Cook the vermicelli according to the instructions on the packet, adding a little blue food colouring

to the cooking water. Once the vermicelli is coloured, set aside in a bowl of cold water. Cut the carrot and

half the cucumber into thin matchsticks. Thinly slice the red cabbage. Slice the radishes into rounds and

thinly slice the avocado.

Moisten a sheet of rice paper and place it on a slightly damp, clean tea towel. Cut off the top

edge of the wrapper (to give a straight side for an open-ended roll). Arrange the lettuce leaves

and vegetables in the middle, starting with the ingredients that will show through. Wrap up the roll,

using your fingertips to tightly close the lower part.

Place the rolls in the refrigerator. At serving time, sprinkle with black and white sesame seeds, then

decorate with stars cut out of the mango or the rest of the cucumber.

Blend the sauce ingredients, except the food colouring, in a food processor. Add the drop of blue food colouring and swirl once with the tip of a knife to make a pretty spiral, then sprinkle with a few sesame seeds. Serve the rolls with the sauce.